Figure 1

Xyloglucan building blocks. Schematic structures of oligosaccharide units XXXG, XLXG, XXLG, XLLG and XXFG that build up xyloglucan of many land plant species. The building blocks are composed of glucosyl units (blue circle) joined together by β1,4 linkages, to which α1,6 linked xylosyl units (orange star) may be added. Galactose (yellow circle) and fucose (red triangle) are incorporated into these structures via β1,2 and α1,2 linkages, respectively.